CVE-2026-49993Public exploit

Source disclosure via headerless cross-origin script requests

Published Jun 12, 2026 · Updated Jun 12, 2026

Information disclosure in Nuxt 3.15.4 through 3.21.6 and 4.0.0 through 4.4.6 allows remote attackers to read bundled source. The dev-server same-origin middleware accepts requests when Sec-Fetch-Site, Origin, and Referer are all absent, exposing webpack chunks to cross-origin scripts. Exploitation requires a webpack or Rspack server bound beyond loopback and a developer opening a malicious same-network site; exposed data includes module source, paths, and inlined strings.

CVSS severity5.9
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Nuxt 3.15.4 through 3.21.6 and 4.0.0 through 4.4.6 allows remote attackers to read bundled source. The dev-server same-origin middleware accepts requests when Sec-Fetch-Site, Origin, and Referer are all absent, exposing webpack chunks to cross-origin scripts. Exploitation requires a webpack or Rspack server bound beyond loopback and a developer opening a malicious same-network site; exposed data includes module source, paths, and inlined strings.

The record

CVE
CVE-2026-49993
Published
Jun 12, 2026
Updated
Jun 12, 2026
Vendor
Nuxt
Product
Nuxt
Classifications
CWE-749, T1189
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 3.15.4, < 3.21.7
  2. Affected versionversion=>= 4.0.0, < 4.4.7

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Nuxt · Nuxtversion=>= 3.15.4, < 3.21.7; version=>= 4.0.0, < 4.4.7

Published CVSS scores

5.7NIST NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
5.9GitHub, Inc.CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-749Exposed Dangerous Method or Function
T1189Drive-by Compromise

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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